Windows 7

3. Click the "Organize" button in the upper left corner of the window and select "Folder and search options."

4. Under the "General" tab, check the "Show all folders" checkbox.

4. Under the "View" tab, select the radio button "Show hidden files, folders, and drives."

5. Click "Apply" then "OK."
6. Make sure the "Windows (C)" drive is selected, and click in the search field in the upper right corner of the window, then click the "Size" link.

7. Click on "Gigantic (> 128 MB)" in the menu if looking for files of that size or larger. The search will take some time and show a green progress bar in the address field since it is searching the entire C: drive.